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  • Results 1 to 4 of 4

    Thread: with a Nexus 220 work for me

    1. #1
      whyme01 is offline Junior Member
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      with a Nexus 220 work for me

      Hi

      Been toying with this idea for a while now, as I am a great believer in “messing” anyway due to space in the garden I have a fibreglass raised pond with viewing window of approx 4000 litres.

      This pond houses only 12 goldfish, has a hoselock Aquaforce 6000 pump in the bottom of the pond connected to 40mm flexi pipe leaving the pond approx 6 inches off the bottom ,fed to a Hozelock Bioforce 6000 pressurized filter, then returning back to the pond via 40mm hose at a height of approx 3ft

      Works well loads of pressure and lift on the return but I want to move on, I know pressurized filters are frowned upon so am looking to buy a Nexus 220 and just replace the pressurized hozelock 6000 filter with the Nexus 220, straight swap.

      Will this work, I cannot upgrade the hoses as they are built into the pond, but can I use the current hozelock aquaforce pond pump to feed the Nexus 220 with it returning back to the pond using existing pipework. I appreciate that as the Nexus is NOT a pressurized system of filtration getting water back to the pond may not work as it does now.

      OK this is OTT for 12 goldfish but I like change and it is gonna do no one any harm only my pockets, Will this work please, same pump in pond, same size pipe work 40mm, Nexus 220 filter, return to pond at 3ft height

    2. #2
      DragonFireSG is offline Senior Member
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      Back when I first started ponding, I was exploring the use of a Nexus. It is essentially a mechanical and moving bed filter rolled into a single unit.

      For a start, here be the manual for the Nexus 220. It is a flexible unit, and can be installed in both pump and gravity fed topologies.

      https://evolutionaqua.com/pub/media/...220-Manual.pdf

      Note that it requires a poured concrete base. The unit is made of molded plastic, and needs a stable, level filter pad or it will distort.
      The N220 is a filter that is far more massive than the Hozelock you are running right now, so make sure you have room for it.

      What you need to consider is the following.

      The return for the nexus is gravity based, 110mm. From my POV, you probably need to do an underwater return with the nexus to allow the gravity return to work.
      Depending on the design of your pond, it might be possible to add some 90mm bulkhead fittings at strategic locations to enable this.

      In this situation, the 110 return will lead to a manifold, and then to 2 or 3 90mm underwater returns.

      A skimming unit can be retrofitted to return water over the top using an external pump.

      Personally, I do not like this option. Too much cutting, to much plumbing.

      =

      What is preferable for me is replacing the Hozelock submersible pump with a retro bottom drain. The 40mm pond outlet will need to be cut out and replaced with a 110mm bulkhead. This is not difficult to do with fiberglass, bulkheads fittings and some sealant.
      You can then gravity feed the nexus. This is preferable as the pump will not fluidize the waste matter or run the risk of jamming from ingesting leaves. A retro bottom drain's sweep pattern will also be superior to that of a submersible pump - especially if coupled with an aeration line.

      A new external pump on the Nexus outlet line will then drive the stock 40mm return. You can look at installing a more efficient pump this way, since you do not need a high head pump in the absence of a pressurized filter downstream.

    3. #3
      DragonFireSG is offline Senior Member
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      It really comes down to whether you are willing to install that bottom drain line. Lots of things start becoming possible if you are. Full range of modern systems like sieves, and even drum filters become possible to install if you take that first step.
      Europe is pretty much at the forefront in that respect, and you have a lot of options to consider.

      Maybe some pictures will help us evaluate things a bit

    4. #4
      DragonFireSG is offline Senior Member
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      This here is what a 110mm bulkhead coupling looks like.

      Through wall installation. You cut a hole, and the fitting screws down on either side. With good gaskets, you don't even need glue to make a watertight joint.
      You might want to seal the cut fiberglass edges with epoxy or superglue first, if you fear moisture infiltration into the fiberglass substrate.

      If you DIY remember that fiberglass dust is nasty stuff. Gloves, eye and respiratory protection. Best have a vac actively sucking up the dust when you are cutting.


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